Method of making lock nuts



Nov. 20, 1928.

J'. G. FURLAN METHOD OF MAKING LOCK NUTS Oigina1 Filed May 1, 1925 mr/vasqfs Patented liov. 20,1928. I I i i I v I i UNITED. STATES PATENTIOFFICE."

JOHN GUY IURLAN, 01 NEW YORK, N. Y1, ASSIGNOR TO FURLAN NUT IIA HINEEI CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

' umnon or uaxme LOOK uu'rs. a nmuonmea lay 1, ma. Serial Imaaasso. 'ne ewea April 1a, was; My invention relates tolock-nuts that are invention, I use the reduced portion for an characterized by; ha two on s of entlrely distinct purpose. By bringing a threads displaced away om eac ot er in swa ing or cold rolling action to bear upon an axial dlrection, so that the threads of the base of the reduced portion next to the 6 one group will be slightly out of helical bodyportion, as shown at 3 in Figure 3 for ahgnment with the threads of the other swagmg and Figure 6 for cold rolling, I group, the result being togive to the nut effect an axial expansion of the nut, as for the well known character of a lock-nut. My Instance from the dotted line shown in Fig invention relates more 3 ecifically to a nut urelO to the full line, the result of which M of this class,in which a b ank provided with is to displace the-threads within the reduced 66 a reduced end ortion is so stretched 'or exextension of the nut from the threads with-v 1 panded at the also of the reduced portion, in the body part of the nut, so as to throw as to produce thelock-nut character above the two groups of threads slightl out of v 7 described. y helical-alignment, producing there y a nut My invention involves a method of mak which will have the'well known properties '70 ing such nuts, which comprises first formof a lock-nut. Owing to the strength of the ing a-nut with a reduced portion, and then body portion of the nut, most of the expanexpandihg the nut at the base of the reduced mm of the metal takes place in an axial, diportion, to give to the nut the lock nut charrection and this expansion is largely con 2o actor, l centrated at the point where the swaging is 75 In the accompanying drawings, I have ildone, so that one or more threads at this lustrated various ways in whic my invenparticular zone, as shown at 4 in Figure 10, tion may becarried out. have their angle slightly increased. At this In said drawings: 4 particular zone, there is also a slight Figure 1 represents a side elevation of a diminution in the diameter of the threads, 80 nut blank. as shown by the dotted contour lines in Fig- Figure 2 shows the same in plan view. ure 10.. This diminution in diameter is not Figure 3 shows the nut blank after it has suflicient, however, to result in any undue been swag'ed into the form of a lock nut. strain or friction that might strip the Figure 3" is a plan view of the swaged threads; when the nut is being applied-0r 86 nut. 1 removed. The slightly stretched, inter- J Figure represents the swaging tool for mediate thread leads gradually from one accomplishing this. group of threads to the other, and the Figure 5 shows another form of nut blank. stretching should be of such an amountthat Figure 5' shows the same in plan view. the metal will be gradually weaved from the go Figure 6 shows the same nut being ex position of one group to the position of the panded into the lock-nut form. other group as the nut is applied and re Fi e 7 shows inplan, the nut and form moved, so that when the nut is so removed, ing 'es' shown inside elevation in Figure-6. the threads of both the nut and the bolt o Figure'8 shows in side elevation, an alter-' be found to be uninjured. native form of nut bla When 'such a nut is apflied to a bolt, one Figure 9 shows a section of the same group o'fthreads, that or instance in the changed into a lock-nut. polygonal or body portion of the'nut, will Figure 10 is a section on an enlar d crowd'one way whlle the other group of 5 scale of a lock nut showing the deformation .threads, say in the rounded reduced portion that'occurs in the process of making the of the nut, will crowd the other way, the same. v friction thus engendered'bringing about the Nut blanks such as shown ,in Figures 1, well known effect of. a lock-nut, namely, one. 5 and 8, may be roduced by drop forging, that cannot be jarred loose, but can be only 50 hot pressing, bull dozing or any of'the well removed by awrench. x own processes for forming nuts. In F igure 1, I have shown a rounded fillet 0 reduced portion 1 of such nuts forms on the forged blank at the base of a rounded an extension from the polygonal portion 2 reduced portion of the nut, namely, at that and has commonly, been used to make' the. portion next to the polygonal part, and in 55 well known crown nut. According to my Figure 3 I have shown thls fillet stamped it has been made to take the shape of a cone, resulting in an up-thrust of the roundline,

ed portion from the dotted line to the full as shown in Figure 3.

In Figures 5 and 8, I show other forms of blanks which, by the action of cold rolling disks 5 (see Figures 6 and 7) have rolled into them at the baseof the reduced portion a groove 6, the metal displaced by the formation of the groove flowing outwardly, so as to produce the effect of stretching or expanding the nut at the zone of the groove.

While I have shown blanks with the reduced portion of the nut of a rounded shape, it will be understood that my invention may also beapplied to blanks where the reduced portion is polygonal, the same as the body portion. By careful design of the shape of the fillet and accurate adjustment of the stroke of the die or of the approach of the rolling disks, it is possible to produce any desired amount of expansion, so that the degree of locking can be predetermined with eat accuracy, thus giving uniform results, which is a feature of great importance in the art of making lock-nuts.

1. The method of making lock nuts which comprises the steps of forming one end of,

the nut of smaller diameter than the body of the nut, and then expanding said smaller end axially to displace the threads at one end of the nut out of helical alignment with the threads at the other end.

- 2. The method of making lock nuts which comprises the steps of forming a rounded portion at one end of the 'nut and then expanding-said rounded portion axially, to displace .the threads. at one end of the nut out of helical alignment with the threads at the other end. 1

3. The method of making lock nuts which comprises the steps of forming a polygonal portion at one end of the nut and a rounded portion at the other end of the nut, and then expanding the said rounded portion next to the polygonal portion, to effect an axial extension 0 the rounded portion from the polygonal portion.

4. The method of making lock nuts which comprises the steps of forming a rounded portion at one end of the nut and then expanding said rounded portion by cold rolling the metal at the base of the said rounded portion, to efiect an axial displacement of the threads of the rounded portion from the threads of the other portion of the V nut.

JOHN GUY FURLAN. 

